<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>vue</title>
</head>
<script src="vue.js"></script>
<body>

    <div id="app">
        <input type="checkbox" v-model="copyright">接受协议<br/>
        <span v-if="!copyright">请先接受协议</span>
        <input v-else type="submit" value="注册">
    </div>

<script>
    var app=new Vue({
        el:'#app',

        data:{
            copyright:false
        }
    });

</script>
</body>
</html>